Another vote for IrfanView - though if you find that you really like another batch processor better but that one messes up the EXIF data, you can use Max Lyon's Thumber to restore the metadata from the copy of your untouched original you saved on CD.

Go to: File > Batch Conversion/Rename, and then click on Advanced Options to set the new size.
Next pick your Input directory/pictures and then specify the output directory in the dialog boxes.
Click on Start when you're ready to start the batch... 8) 8) 8)